Abstract
DNA methylation, which is modulated by both genetic factors and environmental exposures, may offer a unique opportunity to discover novel biomarkers of disease-related brain phenotypes, even when measured in other tissues than brain, such as blood. A few studies of small sample sizes have revealed associations between blood DNA methylation and neuropsychopathology, however, large-scale epigenome-wide association studies (EWAS) are needed to investigate the utility of DNA methylation profiling as a peripheral marker for the brain. Here, in an analysis of eleven international cohorts, totalling 3337 individuals, we report epigenome-wide meta-analyses of blood DNA methylation with volumes of the hippocampus, thalamus and nucleus accumbens (NAcc)—three subcortical regions selected for their associations with disease and heritability and volumetric variability. Analyses of individual CpGs revealed genome-wide significant associations with hippocampal volume at two loci. No significant associations were found for analyses of thalamus and nucleus accumbens volumes. Cluster-based analyses revealed additional differentially methylated regions (DMRs) associated with hippocampal volume. DNA methylation at these loci affected expression of proximal genes involved in learning and memory, stem cell maintenance and differentiation, fatty acid metabolism and type-2 diabetes. These DNA methylation marks, their interaction with genetic variants and their impact on gene expression offer new insights into the relationship between epigenetic variation and brain structure and may provide the basis for biomarker discovery in neurodegeneration and neuropsychiatric conditions.
Original language | English |
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Pages (from-to) | 3884-3895 |
Number of pages | 12 |
Journal | Molecular Psychiatry |
Volume | 26 |
Issue number | 8 |
DOIs | |
State | Published - Aug 2021 |
Externally published | Yes |
Funding
Funders | Funder number |
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National Institutes of Health | |
European Commission | |
Medical Research Council | G1001245, MR/R00465X/1, MR/N027558/1, MR/N000390/1, MR/M013111/1 |
FP7 Joint Technology Initiatives | 115300-2 |
Horizon 2020 Framework Programme | 695313, 857562, 643417 |
National Outstanding Youth Science Fund Project of National Natural Science Foundation of China | B18015 |
Science and Technology Commission of Shanghai Municipality | 16JC1420402, 2018SHZDZX01, 18PJ1400900 |
Medical Research Foundation | MR/R00465X/1 |
Sixth Framework Programme | LSHM-CT- 2007-037286 |
FP7 Health | 603016 |
National Natural Science Foundation of China-Yunnan Joint Fund | 81801773 |
Svenska Forskningsrådet Formas | 259-2012-23 |
National Institute of Biomedical Imaging and Bioengineering | U54EB020403 |
National Institute on Aging | R56AG058854 |